US4054855A - Adjustable-inductance electric coil - Google Patents

Adjustable-inductance electric coil Download PDF

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Publication number
US4054855A
US4054855A US05/668,700 US66870076A US4054855A US 4054855 A US4054855 A US 4054855A US 66870076 A US66870076 A US 66870076A US 4054855 A US4054855 A US 4054855A
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US
United States
Prior art keywords
core
sleeve
core portion
axial passage
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/668,700
Other languages
English (en)
Inventor
Max Schlotterbeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19752512309 external-priority patent/DE2512309C3/de
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US4054855A publication Critical patent/US4054855A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/043—Fixed inductances of the signal type  with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)

Definitions

  • This invention relates to electric coils having means for providing adjustment of the inductance produced by the coil when energized.
  • the configuration of the core may be a round pot core, RM-core, R-core, X-core or parallel-piped core.
  • a vertical cylindrical passage into which a sleeve of a non-magnetizable material is disposed.
  • the sleeve has a hollow cylindrically-shaped body which is threaded internally and has a closed upper end.
  • the sleeve can be provided with longitudinal spaced ribs on its outer surface for engaging the cylindrical passage within the core.
  • the sleeve is then sealed within the passage using a suitable mastic such as an epoxy such that the closed or upper portion of the sleeve is aligned with the top horizontal surface of the core.
  • a suitable mastic such as an epoxy
  • a non-magnetizable shaft carrying a tube core made of a magnetizable material.
  • the other end of the shaft is slotted for engaging a suitable tool. Rotation of the shaft causes a change in position of the tube core which in turn causes the magnitude of the inductance produced by the coil to be changed when the coil is energized.
  • FIG. 1 is a cross-sectional view through an assembled electrically energizable coil.
  • FIG. 2 is a cross-sectional view through an alternate configuration of the sleeve used within the coil of FIG. 1.
  • FIG. 3 is a bottom view of the alternate configuration of the sleeve used in the coil in FIG. 1 and as shown in section in FIG. 2.
  • the coil comprises a top core portion 1 having a central portion 4 and a lower core portion 6 having a like central portion 7 but inverted such that the circle like outer surface of the core portion 1 and 6 serves as a top 11 and bottom 11a respectively of the coil.
  • the coil Through the upper core portion 1 and the lower core portion 6 is an axially disposed vertical cylindrical passage 2 and 8 respectively.
  • the upper core portion 1 and the lower core portion 6 mate to define a circumferent space formed by parts of the inner surfaces of the core portions and the central portions in which space a coil frame 9 and windings 10 are disposed.
  • a sleeve 3 having a hollow cylindrical body, a threaded interior surface and an upper closed end. The closed end is formed having a slight crown or being upwardly concaved.
  • the sleeve 3 is so positioned within the passage 2 that the top of the crowned closed end of the sleeve 3 is aligned with the top horizontal surface 11 of the upper core portion 1.
  • a sleeve 13 as shown in FIG. 2 and FIG. 3 may be provided with intermittently spaced vertical ribs 17 along its outer cylindrical surface such that the ribs interface with the cylindrical passage 2 in the upper core portion 1.
  • the sleeve 3 then is cemented into the passage 2 in the upper core portion 1 by use of a suitable mastic 5.
  • the joint formed by the mastic 5, the sleeve 3 and the passage 2 as shown at 18 can be improved by roughening the surface of the passage 2 and the sleeve 3.
  • a particularly useful mastic material is a two component epoxy type which, because of its hardening and curing properties, creates an excellent interfacing material between the non-magnetic sleeve 3 which has a different coefficient of expansion than that of the magnetic upper core portion 1. Because the rate of cure of the epoxy material can be controlled by the amount of catalyst mixed with it as well as the viscosity of the material controlled by heat, the mastic may be added such that it will harden upon approximately equaling an elevation equal to that of the bottom end of the sleeve 3 when applied at the top of the sleeve 3. The mastic 5 fills the space created by the crowned top of the sleeve 3 so that the top horizontal surface 11 is flush and continuous.
  • an adjusting inductance member 14a comprising a core shaft 14 which is threaded to mate with internal threads 12 provided within the sleeve 3.
  • a tube core 15 made of a magnetizable material.
  • a non-magnetizable tool engaging end portion 16 having a tool engaging slot.
  • FIG. 2 and FIG. 3 is shown an alternate configuration of a crowned sleeve 13 having a closed end portion 13a and a threaded interior 12 prepared for the disposition of an adjustable inductance member.
  • the lower portion 13b of the sleeve 13 has a slightly bevelled exterior surface which provides a guiding means to allow the sleeve to be more easily inserted into a cylindrical passage in a core portion.
  • Intermittently spaced about the peripheral surface of the sleeve 13 are four vertical ribs 17 so dimensioned to fit within the passage 2 of the upper core portion 1.
  • the mastic 5 fills the spaces created between the ribs 17 to form a continuous cross section.
  • Inductance may be roughly and finely adjusted by the user.
  • a rough adjustment may be made by removing the shaft 14 from the coil and adjusting the location of the tube core 15 on the shaft 14. The shaft is then repositioned in the coil to engage the core sleeve 3.
  • a fine adjustment can then be made by rotating the shaft 14 with a suitable tool engaged in the slot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
US05/668,700 1975-03-20 1976-03-19 Adjustable-inductance electric coil Expired - Lifetime US4054855A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DT2512309 1975-03-20
DE19752512309 DE2512309C3 (de) 1975-03-20 Induktivitätsabgleichbare elektrische Spule

Publications (1)

Publication Number Publication Date
US4054855A true US4054855A (en) 1977-10-18

Family

ID=5941952

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/668,700 Expired - Lifetime US4054855A (en) 1975-03-20 1976-03-19 Adjustable-inductance electric coil

Country Status (3)

Country Link
US (1) US4054855A (it)
FR (1) FR2305003A1 (it)
IT (1) IT1056984B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001854A1 (en) * 1982-11-05 1984-05-10 Spang Ind Inc Adjustable air gap ferrite structures and methods of manufacture
WO1984001852A1 (en) * 1982-11-05 1984-05-10 Spang Ind Inc Inductance tuning means and methods of manufacture
US4649337A (en) * 1985-03-14 1987-03-10 General Electric Company Phase lag adjustment in electric meter
US6731524B2 (en) 2001-05-21 2004-05-04 Marconi Communications, Inc. Parallel connected DC regulators with power factor corrected rectifier inputs
US20040113739A1 (en) * 2000-12-07 2004-06-17 Delta Electronics Inc. Low profile transformer
US20060215381A1 (en) * 1994-04-26 2006-09-28 Comarco Wireless Technologies, Inc. Programmable power supply

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054341A (it) * 1900-01-01
FR980263A (fr) * 1943-01-11 1951-05-10 Perfectionnements aux selfs pour appareils de t.s.f. et autres applications
FR1032117A (fr) * 1950-03-06 1953-06-30 Oerlikon Maschf Isolateur en céramique
US2905913A (en) * 1954-12-14 1959-09-22 British Telecomm Res Ltd Inductors for use in light current electrical circuit
GB924549A (en) * 1961-01-10 1963-04-24 Ericsson Telefon Ab L M A holder for use in the fixing in position of a trimmer core in an inductance coil
US3254319A (en) * 1960-06-23 1966-05-31 Philips Corp Variable inductors
US3262079A (en) * 1963-07-05 1966-07-19 Int Standard Electric Corp Adjustable inductor
US3480896A (en) * 1967-11-01 1969-11-25 Components Corp Adjustable inductor
GB1224459A (en) * 1969-06-27 1971-03-10 Standard Telephones Cables Ltd Magnetic core assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR924139A (fr) * 1946-02-28 1947-07-28 Perfectionnements aux noyaux magnétiques pour circuits oscillants

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054341A (it) * 1900-01-01
FR980263A (fr) * 1943-01-11 1951-05-10 Perfectionnements aux selfs pour appareils de t.s.f. et autres applications
FR1032117A (fr) * 1950-03-06 1953-06-30 Oerlikon Maschf Isolateur en céramique
US2905913A (en) * 1954-12-14 1959-09-22 British Telecomm Res Ltd Inductors for use in light current electrical circuit
US3254319A (en) * 1960-06-23 1966-05-31 Philips Corp Variable inductors
GB924549A (en) * 1961-01-10 1963-04-24 Ericsson Telefon Ab L M A holder for use in the fixing in position of a trimmer core in an inductance coil
US3262079A (en) * 1963-07-05 1966-07-19 Int Standard Electric Corp Adjustable inductor
US3480896A (en) * 1967-11-01 1969-11-25 Components Corp Adjustable inductor
GB1224459A (en) * 1969-06-27 1971-03-10 Standard Telephones Cables Ltd Magnetic core assembly

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001852A1 (en) * 1982-11-05 1984-05-10 Spang Ind Inc Inductance tuning means and methods of manufacture
US4511872A (en) * 1982-11-05 1985-04-16 Spang Industries Inc. Inductance tuning means and methods of manufacture
US4523170A (en) * 1982-11-05 1985-06-11 Spang & Company Adjustable air gap ferrite structures and methods of manufacture
WO1984001854A1 (en) * 1982-11-05 1984-05-10 Spang Ind Inc Adjustable air gap ferrite structures and methods of manufacture
US4649337A (en) * 1985-03-14 1987-03-10 General Electric Company Phase lag adjustment in electric meter
US20060215381A1 (en) * 1994-04-26 2006-09-28 Comarco Wireless Technologies, Inc. Programmable power supply
US7613021B2 (en) 1994-04-26 2009-11-03 Comarco Wireless Technologies, Inc Small form factor power supply
US20080151581A1 (en) * 1994-04-26 2008-06-26 Comarco Wireless Technologies, Inc. Small form factor power supply
US7266003B2 (en) 1994-04-26 2007-09-04 Comarco Wireless Technologies, Inc. Programmable power supply
US20060227580A1 (en) * 1994-04-26 2006-10-12 Comarco Wireless Technologies Inc. Programmable power supply
US20040113739A1 (en) * 2000-12-07 2004-06-17 Delta Electronics Inc. Low profile transformer
US20040208027A1 (en) * 2001-05-21 2004-10-21 Elek Joseph F Power system with coupled inductor
US20040213025A1 (en) * 2001-05-21 2004-10-28 Elek Joseph F. Power supply system
US6853167B2 (en) 2001-05-21 2005-02-08 Joseph F. Elek Power supply system
US6853561B2 (en) 2001-05-21 2005-02-08 Joseph F. Elek Power system with zero voltage switching
US6856526B2 (en) 2001-05-21 2005-02-15 Joseph F. Elek Power system with phased controlled inrush limiter
US6809941B2 (en) 2001-05-21 2004-10-26 Marconi Intellectual Property (Ringfence) Inc. Power system having a power factor correction circuit
US20040208028A1 (en) * 2001-05-21 2004-10-21 Elek Joseph F. Power system with zero voltage switching
US20040207371A1 (en) * 2001-05-21 2004-10-21 Elek Joseph F. Power system with phased controlled inrush limiter
US20040150377A1 (en) * 2001-05-21 2004-08-05 Elek Joseph F. Power system having a power factor correction circuit
US6731524B2 (en) 2001-05-21 2004-05-04 Marconi Communications, Inc. Parallel connected DC regulators with power factor corrected rectifier inputs

Also Published As

Publication number Publication date
FR2305003A1 (fr) 1976-10-15
DE2512309B2 (de) 1977-03-24
FR2305003B1 (it) 1978-05-19
DE2512309A1 (de) 1976-09-23
IT1056984B (it) 1982-02-20

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